An error occurred trying to position a stream to its prior location after a reopen of the read/update DCB was needed to update the last known TTR (file position) and block number for a stream that had been simultaneously been open for read with a stream that was just closed. The READ macro failed. The SIGIOERR is raised (if needed). Further reads are prevented until a reopen and reposition.
Check the AMRC for details of the error. In the SIGIOERR handler, the AMRC2 can be checked to find the stream that incurred the error.
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